#Ruby

Recently I have implemented a small piece of functionality, which is suitable to be a small challenge.
Description Given a string with opening and closing tags (e.g., <mark></mark>), return a string without tags and indices of opening and closing tags. For example, given a string: "we eat <mark>healthy</mark> and <mark>tasty</mark> food." We expect to receive a string: "we eat healthy and tasty food.", and an array with pairs of indices: [[7, 14], [19, 24]].
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